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  3. Mineral Resource Data System (MRDS)

Alta Mine

Occurrence in Calaveras county in California, United States with commodity Chromium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10028795
MRDS ID M005997
Record type Site
Current site name Alta Mine
Related records 10235534

Geographic coordinates

Point of reference Centroid
Geographic coordinates: -120.6225, 38.01114 (WGS84)
Relative position Original record had no geographic coordinates; these coordinates were derived from the PLSS description provided.

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Angels Camp(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Stanislaus(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Calaveras

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 002N 012E 14,23 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Nearby scientific data

Centroid (1) -120.6225, 38.01114
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: A NUMBER OF SMALL DISCONTINUOUS CHROMITE LENSES, PODS, AND SMALL LAYERS OF DISSEMINATED CHROMITE PRESENT IN A WIDE NW-STRIKING BELT OF SERPENTINE, ALONG WITH DUNITE AND SMALL AMOUNTS OF IMPURE TREMOLITE ASBESTOS. ORE BODIES HAVE A N. 45 DEG. W. TO N. 55 DEG. W. STRIKE AND DIP STEEPLY TO NE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Comments on the production information

  • UNDERGROUND AND SURFACE DEVELOPMENT WORK BEING DONE IN 1958; SMALL AMOUNT OF ORE HAD BEEN STOCKPILED. 45' VERTICAL SHAFT WITH 35' NW DRIFT AT BOTTOM; LENS OF CHROMITE 3' LONG AND A FEW INCHES THICK EXPOSED IN THE DRIFT. SEVERAL OPEN CUTS.

Reference information

Bibliographic references

  • Deposit

    CALIF. COUNTY REPT. NO. 2, P. 21,128 AND PL.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-72 Gere, W. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.